Mark Twain (2014). “Mark Twain on Common Sense: Timeless Advice and Words of Wisdom from America's Most-Revered Humorist”, p.37, Skyhorse Publishing, Inc.
James Howell (1726). “Epistolæ Ho-Elianæ: Familiar Letters Domestick and Foreign, Divided Into Four Books; Partly Historical, Political, Philosophical. Upon Emergent Occasions”, p.366
Robert Louis Stevenson (2015). “Collected Memoirs, Travel Sketches and Island Literature of Robert Louis Stevenson: Autobiographical Writings and Essays by the prolific Scottish novelist, poet and travel writer, author of Treasure Island, The Strange Case of Dr. Jekyll and Mr. Hyde, Kidnapped & Catriona”, p.473, e-artnow
James Howell (1726). “Epistolæ Ho-Elianæ: Familiar Letters Domestick and Foreign, Divided Into Four Books; Partly Historical, Political, Philosophical. Upon Emergent Occasions”, p.366
Walter Scott (2015). “Sir Walter Scott: Collected Letters, Memoirs and Articles: Complete Autobiographical Writings, Journal & Notes, Accompanied with Extended Biographies and Reminiscences of the Author of Waverly, Rob Roy, Ivanhoe, The Pirate, Old Mortality, The Guy Mannering”, p.195, e-artnow
Thomas Jefferson (1853). “The writings of Thomas Jefferson: being his autobiography, correspondence, reports, messages, addresses, and other writings, official and private”, p.315